<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>按钮组</title>
  <link rel="stylesheet" href="../btn.css">
</head>
<body>
<div class="btn-group">
    <button class="btn btn-success">按钮1</button>
    <button class="btn btn-danger">按钮2</button>
    <button class="btn btn-danger">按钮2</button>
    <button class="btn btn-danger">按钮2</button>
    <button class="btn btn-warning">按钮3</button>
</div>

</body>
</html>